package com.api.gbhg.liuwenbo.test;

import java.util.HashMap;
import java.util.Map;

public class a3_8 {
    public static void main(String[] args) {
        Map<String,String>[] map = new HashMap[1];
        map[0] = new HashMap<>();
        map[0].put("1","1");
        map[0].put("2","2");
        map[0].put("3","3");
        map[0].put("4","4");
        String[] fieldName =null;
        System.out.println(map[0].isEmpty());
        fieldName = map[0].keySet().toArray(new String[map[0].keySet().size()]);
        System.out.println(map[0].keySet().toArray(new String[map[0].keySet().size()]).length);
    }
}
